There was an article this week on the BBC website regarding a German company that believe they have developed a battery that no longer relies on the heavy metals that are hard to source and that will give approx. 600 miles on a single charge. Estimate was for a production model within 5 years.
Technology is always getting better and I think an electric car in the mid 20s will outrun a Diesel engine with ease so an electric plane within 10-15 years should be feasible.
Haven’t EasyJet set themselves a target to fly an electric plane by 2028?